Abstract
The photoconductivity (PC) of electron irradiated semiconducting diamond was examined over the energy range 1–4 eV (0.3–1.2 μm) and over the temperature range 76–500 K. The PC response spectra exhibited a strong drop below 3 eV. In one sample (RDl) this drop was by a factor of nearly 10 4 from 3 to 2 eV. In the range of the Ar laser lines (2.41–2.73 eV) the PC depended nearly exponentially on photon energy. A mechanism involving competition for the absorption of the exciting light between the non-photoconductive GRl system and the photo-conductive UV absorption band gives a good account of the experimental results. This includes the photon energy dependence of the PC and its thermal dependence. The proposed mechanism is further supported by the absence of the drop in PC near 2.5 eV in a lightly colored electron irradiated diamond.
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